<template>
    <div>
     <!-- 面包屑导航 -->
     <el-breadcrumb separator="/">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>权限管理</el-breadcrumb-item>
       <el-breadcrumb-item>角色列表</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
         <!-- 添加角色按钮区域 -->
         <el-row>
             <el-col>
                 <el-button type="primary">添加角色</el-button>
             </el-col>
         </el-row>
         <!-- 角色列表区域 -->
         <el-table :data="rolelist" border stripe>
            <!-- 展开列 -->
            <el-table-column type="expand">
                <template slot-scope="scope">
                    <el-row :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
                    <!-- 渲染一级权限 -->
                    <el-col :span="5">
                        <el-tag  closable @close="removeById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                        <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!-- 渲染二级 和三级权限 -->
                    <el-col :span="19">
                        <!-- 通过for循环嵌套渲染二级权限 -->
                        <el-row v-for="(item2, i2) in item1.children" :key="item2.id" :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']">
                            <el-col :span="6">
                                <el-tag type="success"  closable @close="removeById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                                <i class="el-icon-caret-right"></i>
                            </el-col>
                            <el-col :span="18">
                                <el-tag v-for="(item3) in item2.children" :key="item3.id" type="warning" closable @close="removeById(scope.row, item3.id)">{{item3.authName}}</el-tag>
                            </el-col>
                        </el-row>
                    </el-col>
                </el-row>
                </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="角色名称" prop="roleName"></el-table-column>
            <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
            <el-table-column label="操作" width="300px">
                <template slot-scope="scope">
                    <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
                    <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
                    <el-button type="warning" icon="el-icon-setting" size="mini" @click="showSetRightDialog(scope.row)">分配权限</el-button>
                </template>
            </el-table-column>
         </el-table>
     </el-card>

     <!-- 分配权限的对话框 -->
     <el-dialog
         title="分配权限"
         :visible.sync="setRightDialogVisible"
         width="50%" @close="setRightDialogClosed">
         <!-- 树形控件 -->
         <el-tree :data="rightslist" :props="treeProps" show-checkbox default-expand-all node-key="id" :default-checked-keys="defKeys" ref="treeRef"></el-tree>
         <!-- 底部确定取消 -->
         <span slot="footer" class="dialog-footer">
           <el-button @click="setRightDialogVisible = false">取 消</el-button>
           <el-button type="primary" @click="allotRights">确 定</el-button>
         </span>
       </el-dialog>
    </div>
</template>
<script>
export default {
  data () {
    return {
      // 所有角色列表区域
      rolelist: [],
      // 控制权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 角色所有权限的数据
      rightslist: [],
      // 树形控件绑定对象
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 默认选中的节点的Id值
      defKeys: [],
      // 即将分配权限的角色id
      roleId: ''
    }
  },
  methods: {
    async getRoleslist () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('获取角色列表失败')
      } else {
        this.rolelist = res.data
        // console.log(this.rolelist)
      }
    },
    // 根据id删除对应得权限
    async removeById (role, rightId) {
      // 弹框提示用户是否删除
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      } else {
        const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

        if (res.meta.status !== 200) {
          return this.$message.error('删除角色权限失败！')
        } else {
          this.$message.success('删除角色权限成功')
          // this.getRoleslist()，直接调用会造成页面重绘
          role.children = res.data
        }
      }
    },
    // 分配权限
    async showSetRightDialog (role) {
      // 先把id绑到data中，方便后续调allotRights()使用
      this.roleId = role.id
      // 请求tree型权限数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取当前角色权限数据失败')
      } else {
        // 把获取到的数据保存到rightlist中
        this.rightslist = res.data
        // console.log(this.rightslist)
      }
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      // 展示分配权限对话框
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到 defKeys 数组中
    getLeafKeys (node, arr) {
      // 如果当前node节点不包含children属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 关闭分配权限对话框后，将defKeys数组清空
    setRightDialogClosed () {
      this.defKeys = []
    },
    // 点击确定，为角色分配权限
    async allotRights () {
      // 展开运算符骚操作
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      const idStr = keys.join(',')
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: idStr })
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败')
      }
      // 提示用户成功
      this.$message.success('分配权限成功')
      // 刷新列表
      this.getRoleslist()
      // 关闭对话框
      this.setRightDialogVisible = false
    }
  },
  created () {
    this.getRoleslist()
  }
}
</script>
<style lang="less" scoped>
.el-tag{
    margin: 7px;
}
.bdtop{
    border-top: 1px solid #eee;
}
.bdbottom{
    border-bottom: 1px solid #eee;
}
</style>
